When set to a file name, the file is opened. When set to an empty string, the file is closed.

When set to an empty string and then changed to a file name, a file is created or opened according to FileMode. If an existing file is opened, the value of the Size property determines how the file is treated:

• If Size = 0 when the file is opened, it is assumed the file is being opened for reading, and Size is set to the size of the file.
• If Size > 0 when the file is opened, it is assumed the file is being opened for writing, and the existing contents of the file are replaced.

When set to a file name and then changed to an empty string, all data in the file is buffered to memory and the file is closed.

When set to a file name and then changed to a different file name, the file is moved to the new location. If FileMode = createUnique, an existing file cannot be unintentionally overwritten.

You can delete a file only by setting this property to an existing file name, setting FileMode to createOpen or createExisting, setting DeleteOnDestroy to True, and allowing the DartStream Object to be destroyed.

DartStream Object  | DartStream Members